Chemistry - Hydrogen and Its compound Question with Solution | TestHub

The incorrect statements are A and B. Nascent hydrogen is more reactive than molecular hydrogen, but not atomic hydrogen. Water obtained from ion exchange resin is demineralized and not suitable for direct drinking due to lack of essential minerals.

Statement C is correct: Iron chromate is used as a catalyst in the water gas shift reaction.

Statement D is correct: Permanent hardness is caused by soluble salts of ${\mathrm{Ca}}^{2+}$ and ${\mathrm{Mg}}^{2+}$ ions.